No exploitation reportedFix available

CVE-2016-4344

Q: Is CVE-2016-4344 actively exploited?

Active exploitation of CVE-2016-4344 has not been confirmed. Its EPSS score was 5.2% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2016-4344?

CVE-2016-4344 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

No exploitation reported by the sources we read.

Published2016-05-22
Fixed in7.0.4
WeaknessCWE-190

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Integer overflow in the xml_utf8_encode function in ext/xml/xml.c in PHP before 7.0.4 allows remote attackers to cause a denial of service or possibly have unspecified other impact via a long argument to the utf8_encode function, leading to a heap-based buffer overflow.

Timeline

dates in UTC

2016-05-2201:59CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2016-4344?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2016-4344?format=csv
TAXII collection of exploited CVEs
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Versions per branch

NVD

PHP

Branch	Affected	Fixed in	Source
7.0	≥ 7.0.0, < 7.0.4	7.0.4	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update PHP to 7.0.4

Advisories and patches

php.netRelease Notes · Vendor Advisory
bugs.php.netPatch · Vendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.19.8read 2026-10-23
NVDCVSS 2.07.5read 2026-10-23
NVDweakness (CWE)CWE-190read 2026-10-23
FIRST EPSSEPSS score5.2 %2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2016-05-22
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2016-4344?

Is CVE-2016-4344 actively exploited?

Active exploitation of CVE-2016-4344 has not been confirmed. Its EPSS score was 5.2% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2016-4344?

CVE-2016-4344 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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